There are several synonyms for the term "flood control channel." One of the most common alternatives is "stormwater channel," which refers to a channel designed to efficiently carry rainwater and excess water from storm events. Another synonym is "drainage canal," which denotes a long, open canal designed to direct water away from an area. Some other options include "waterway," "streambed," "watercourse," and "water channel." All of these phrases can be used to describe a man-made or natural channel that is designed to manage high volumes of water, prevent flooding, and protect nearby communities from water damage.